Apparatus for magnetizing desulfurized ores.



G. S. BROOKS. APPARATUS FOR MAGNETIZING DESULFURIZED ORES.

APPLICATION FILED JULY 17, 1909. 1,090,516, 7 I Patented l lar. 17,1914

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INVENTOR ATTURN ii! chem-0 G. s. BROOKS.

APPARATUS FOR MAGNETIZING DESULFURIZED ORES.

I 'A PPLIUATION FILED JULY 17,-1909. 1 ,090,5 1 6 Patented Mar. 17, 1914.

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such as will enable 0t UNITED STATES PATEN GEORGE SAGE BROOKS, OF IiEPUE, ILLINOIS, ASSIGNOR TO MINERAL POINT dINO COMPANY, OF DET'giE, ILLINOIS, A CORPORATION OF NEW JERSEY.

APPARAT 'e-"S FOR MAG-NETIZING- DESUIAFURIZED GEES.

Specification of Iietters Patent. Application filed July 17, 1909. Serial No. 508,171.

Patented Mar. 1'3, 1914i.

To all whom it may concern: 1

Be it known that I, GEORGE SAGE BROOKS, a citizen of the United States, residing at Depue, in the county of Bureau and State of Illinois, have invented certain new and useful Improvements in Apparatus for Magnetizing Desulfurized Ores; and I do hereby declare. the following to be a full, clear, and exact descri tion of the'invention, liers skilled in the art to which it appertains to mane and use the same.

In an a plication for Letters Patent of the United States, of even date herewith Ser.

No. 508172, I have described a method, of my invention, for effectively separating, by low intensity magnets, ores originally consisting. of mixed iron sulfid (pyrite or marcasite) and zinc sulfid (zinc blende), and, at the same time, recovering, in utilizable form, the sulfur and iron byproducts.

The present invention relates to a form of apparatus devised by me for carrylng out the main portion of the method, to wit, the

conversion of the iron ore constituent of the mixed ore, after the' ore has been subjected the iron ore constituent and the iron-carry-- to a dead roast, into magnetic iron oxid, thereby increasing the magnetic gap between and partial elevation of my said preferred form of apparatus for subjectin the deadroasted ore to the action of a reducing gas; Fig. 2 represents a top plan view thereof,

partly in section; Fig. 3 represents an end elevation, partly 1n sectlon; Figs. 4 and 5; represent vertical cross sections, taken re-' spectively on planes indicated by the lines 4 4 and 55 of Fig. 1. Fi s. 6 and 7 represent detail views of one of the lifting cups or pockets employed for lifting an dropping the desulfurized ore as it progresses throughthe apparatus.

. with a side opening Referring to the drawings,A indicates a long trough-like or U-shaped chamber, mounted upon a supporting frame tvork, B, which 1ves it a suitable slope or inclination n the. irection of its length. The chamber s lined with fire-brick or the like, inclosed m an outer metallic shell, and is rovidcd wlth' end caps .a, having stuffing ones 1'2, packed with asbestos rope and plumbago or similar material, through which extends the rotary shaft E, preferably made hollow, so as to be protected by the cooling action of a current of water passing-through it.

At one end, the chamber A is provided.

having a vertically slidable gate a, locate within the feed hopper C the adjustment of the gate corresponding to the desired feed of the desulfurized ore. to the chamber. The gate and feed hopper are also of refractory material, so as to.

withstand the heat of the hot desulfurized oretaken directly from the roaster and the opening from the hopper into the chamber A is kept sealed by the ore during the operation.'

The chamber A is provided with en lothat there will be no tendency for air to enter the chamber.

At its delivery end, the chamber A is providedwith a discharge pipe d, closed by the movable slide f from which pipe the magnetized ore is drawn periodically, when it has accumulated therein in sufficient quantit from its continuous source of supply.

he reducing gas (preferably hot pnr ducer gas, direct from the producer) is admitted at one end of the chamber A through the brick-lined flue D, and the waste gaseous products are allowed to escape at the Cit opposite end through a closely-regulated valve in the gas-outlet pipe m.

The movement of the roasted ore through the chamber is made possible the slope of its bottom, along which it gradually passes, when lifted and dropped the slowly revolving cups or pockets 0) shown in detail in Figs. 6 and 7. These cups or pockets are mounted along side of each other, from end to end of the shaft E, and are for liftin the ore, and are provided with semicylin rical hub portionss, having keys t cast thereon and which engage key ways on the shaft. The cups are removably and adjustably locked to the shaft by means of the clamping bolts and nuts shown.

' In. practising the method set forth in my co-pending application hereinbefore referred to, the ore, containin the mixed iron sulfid and zinc blende to e separated, is first subjected to a preliminary dead roast in any suitable furnace, thereby permitting the S0 from the roasting furnace to be utiiized as a source of commercial production of sulfuric acid (for instance, by the contact process) Care is to betaken in the dead-roasting of the ore to avoid, as far as possible, any substantial fusing or sintering together of the material, so that it may be withdrawn from the roasting furnace in a fairly granular and orous condition. While still retaining the ieat, orhsubstantially the heat of the roasting operation, the desulfurize ore is then admitted,-through the feed hopper G and gate c,into the chamber A, wherein the shaft E and its revolving cups receive a slow movement of rotation through the intermediacy of the driving sprocket F fixed upon the shaft and actuated, from any suitable souree of power, at a rate that may be varied according to circumstances, from, say, forty'minutes to three hours, as determined by tests of the-product of the operation. In the meantime, hot producer gas is admitted through the flue D, under such pressure as will exclude the entrance of air into the chamber A. The producer gas passes through the ore, lifted and dropped into the gas current by the revolving cups, and is thus brought into intimate contact with it, the waste gaseous products issuing through the closely-regulated gas exit pipe m. The chief reaction of the producer gas upon the ore may be expressed by the formula that is, the carbon monoxid present in the producer gas converts the ferric oxid of thefavorably, at or about a low red heat,-say from 400 C. to 650 C.

Of the iron present in the zinc blende const'ituent of the ore, a large percent. is magnetic after the dead roasting operation. Therefore, the more magnetic the iron ore constituent can be made. in the chamber A,

the greater will be the gap between the magnetic attractability or ermeability of the iron ore particles, and t e particles of roasted blende with their small amount of magnetic iron, and the cleaner and sharper will be the subsequent magnetic separation. This gap I bring approximately to the attainable maximum, with the result that after the ore has passed through the chamber A, into the discharge pipe (1, (from which it is removed periodically as required) it maybe passed over orotherwise subjected to the se arating actionof a magnetic separator of t e usual low or moderate magnetic field intensity, and a commercially complete separation obtained of the roasted and ma etized iron ore from the roasted iron-carrying blende.

Having thus described my invention, what I claim is:

gap between the iron ore constitutent and the zinc ore constituent of dead roasted mixed sulfid ore, consisting of a. chamber having refractory walls, a feed hopper for su'ppl ing the roasted'ore to one end of said chain er, means for progressing the ore through the chamber and" for lifting and dropping it during its progress, a gas inlet flue for supplying fa reducing gasvto the chamber, and exit'passa es for the waste gases and for the reduce ore product, said chamber being further provided with explosion,doors resting in sand seals and constituting a part of the top Wall or cover of the chamber; substantially as described.

2. Apparatus for increasing the magnetic gap between the ironore constituent and the ,co 1. Apparatusfor increasing the magneticzinc ore constituent of dead roasted mixed inclination to the chamber, a feed; hopper for *11 o ening in'one"=?- finsaid opening, stuffing boxes at the ends of the charm a rotatory shaft passing through the supplying-the roasted ore to said chamber at its upper portion through an of its sides, a regulating gate ber stuiiing boxes, lifting cups mounted upon the shaft and operating along the curved bottom of the U-shaped chaIi-lber, explosion doors forming a portion of the top wall or cover of the chamber, a gas inlet flue for supplying a reducing gags toflhe chamber, and exit pass'ages for the waste g 'sesand for theggguced oreproduct; substanlially as dc.- scn 3. In apparatus for the purposes de- 1 ing holrs and nuts for renmmhly locking the u n v i '1 scribed, the comblnnhon wlth the lnchned cups to the shaft; snbstanuelly as desermem l6 rednmng chamber of means for hftmg and In l'estunony whereof 1 afiix my 551;?

(ll-upping ore, consisting of a rotatory shaft ture, in presence of two Witnesses.

5 having mounted thereon a series of cups 01" }EO:RGE SAGE BRGOKS.

pe-f'kets pl-onded wlth sectlonal hub p0r--j W1tnesses:

tmns with keys east. therein engaging eerre- HENRY A. KRETSGH, spondmg key-Ways 011 the shaft, and clamp- J. A. GURNETI. 

